Sudden change in Husky 137 chainsaw idle speed

Are you running out of gas?

Be careful it is not an air leak will make it run lean and burn it up.

I ran it dry last fall but it's got plenty of gas now.

I'm kind of concerned that it might have a particle blocking the flow of gas and causing it to run lean. But would that necessarily make it run fast on idle? And would it go away after running it for 15 minutes like it did last fall?

I had a 16 hp Johnson snowmobile and one night it leaned out. I could keep up with the neighbors 500 TX Polaris for a few hours but then it got slower and slower. We ended up replacing one of the cylinders.

Could be trash or could be one of your control linkages binding. Everything nice and free?

I would pull the plug and have a close look and see if it's burned the plug, replace it if in any doubt, check the fuel supply line, if you can blow everything out with air (carefully) and really clean everything up and make sure the linkage etc are all clear and not binding or filled with dirt etc.

I would also suggest buying a can of Husky Pre-mix which is not only mixed 94 octane & 50:1 oil but it has a conditioner in it. You'll also know that the gas is good (apparently there has been a few not so great batches of gas hit the market).

Even though there is a spring on the idle screw, these buggers vibrate like hell and after a while it can dial out as a result. The spring can be replaced (get the right one for the job) also check the carb screws etc to make sure everything is still tight, maybe sucking a bit of air in. I only say that because you say once heated up it (15 min run) it goes back to good idle.

Whatever it was has seemed to have fixed itself.

One thing people with two strokes should learn to do is read the plug color. A good running 2 stroke with a perfectly adjusted carb the color of the plug should look like a nice cup of cofffe with cream.

Al